WO1999023198A1

WO1999023198A1 - Soap mold having a detachable insert

Info

Publication number: WO1999023198A1
Application number: PCT/EP1998/006943
Authority: WO
Inventors: Jürgen Harms; Reinhard Kahmann; Hans-Georg Raschper
Original assignee: Sela-Maschinen Gmbh
Priority date: 1997-11-03
Filing date: 1998-11-03
Publication date: 1999-05-14
Also published as: AU1665799A; DE19748370C2; DE19748370A1

Abstract

The invention relates to a soap mold (1) for pressing or stamping soap pieces in which at least one shell-shaped indentation (2) is provided in the soap mold. A prefabricated, one-piece, plastic insert (4) which can be detached from the soap mold is placed inside the indentation (2) of said soap mold (1). The insert (4) essentially imitates the shape of the indentation (2) of the soap mold.

Description

SOAP FORM WITH DETACHABLE INSERT

The invention relates to a soap mold for pressing or punching soap bars.

According to the prior art, soap bars are pressed or stamped into soap molds, the soap molds being designed such that they can be moved relative to one another. The soap molds have at least one bowl-shaped depression for the reception of one "half of soap sticks.

According to the prior art, the soap molds consist of a non-elastomeric and an elastomeric part. The elastomeric part is the part that comes into contact with the soap mass. This is provided so that the soap is more easily detached from the soap mold after pressing or punching.

Such soap molds with a coating of an elastomeric plastic are known, for example, from international patent application WO 96/00278 AI and from European patent EP 0 276 971 B1. According to the latter document, the elastomeric part consists of natural rubber, silicone rubber, polyurethanes or butyl rubber. The elastomeric layer is 0.2 to 10 millimeters thick.

These prior art coatings of soap molds have the disadvantage that the coatings are arranged directly on the soap mold as an elastic layer adhering to them.

If the coating is worn or damaged, for example by a scratch, the coating must be removed from the soap mold. Since the coating adheres directly to the mold, it has to be removed mechanically and / or chemically in a complex and cumbersome manner.

When applying a new coating, the form known from WO 96/00278 AI must be completely free of grease. It is therefore an expensive one Cleaning required, which is particularly difficult with molds for soap production, wherever there are fats.

To change the coating of the soap molds, the soap mold must therefore be removed from the device for producing the soap bars. In most cases it is even necessary to send the soap mold to the manufacturer or to specialty companies. During this time, a replacement soap mold is required, which is very expensive. In addition, transporting the soap mold to the manufacturer is time-consuming and costly.

The technical problem on which the invention is based is to provide a coating for a soap mold which can be replaced easily and inexpensively on site.

This technical problem is solved by the soap mold with the features of claim 1.

The soap shape according to the invention is characterized by a

Coating, which is used in the form of a prefabricated removable insert in the recess.

The insert does not adhere to the mold, but can essentially be removed from the mold in one piece after wear or damage. For this purpose, any holding means that may be provided, which connect the insert to the soap mold and fix it in the recess, only have to be loosened. However, it is not necessary to remove the soap mold itself or even send it back to the manufacturer. The new coating in the form of the insert can also be attached to the soap mold in the simplest way, without the soap mold having to be removed or sent in for this purpose.

The use according to the invention also has the advantage that it does not have to be applied, as is the case with liquid coatings belonging to the prior art, with unevenness or Irregularities result. The coating according to the invention in the form of the insert is prefabricated and is supplied completely in order to replace the coating. So soap bars can always be made in the same quality, because the use can always be made in the same way. The shape itself does not wear out.

The use according to the invention advantageously extends at least partially over the edge of the at least one depression in the soap mold, so that a complete coating of the soap mold is also present in the edge region and the soaps also meet the required quality requirements in the edge region.

The insert according to the invention has a uniform layer thickness in order to be able to produce soap bars of optimal quality.

In addition, the insert according to the invention has a very smooth surface. This makes it possible to produce very shiny soaps.

In the use according to the invention, a lettering, for example the name of the soap, is expediently provided. The insert advantageously has recesses on the side facing the soap mold. A lettering in the soap form engages in these recesses. This ensures that the lettering of the insert according to the invention is not deformed when pressing or punching the soaps, but is stabilized by the protrusions of the lettering of the soap mold.

The insert according to the invention is detachably fastened to the soap mold with at least one screw or at least one plug connection, for example a tongue and groove connection. For this purpose, the soap mold has corresponding bores with threads or recesses, for example dovetail-shaped recesses.

The screw and / or plug connection is advantageously arranged outside the respective depression, so that no disturbing influences occur within the depression of the soap mold when the soap is pressed or punched. The insert according to the invention expediently has at least one opening for an ejector reaching through the opening. The ejector is used so that the soaps are pressed out of the mold after pressing or punching. The ejector has to go through the

Coating, that is to say through the insert, in order to detach the soaps from the depressions in the soap mold.

According to the invention, the insert has a layer thickness between ten micrometers and five millimeters. However, it is also possible to make the coating thinner than ten micrometers.

The ejector advantageously also has a coating. The coating of the ejector can be a coating belonging to the prior art. However, provision can also be made to design the ejector with the coating according to the invention in the form of a plate or an insert.

Another possibility according to the invention is to design the ejector completely from plastic, in particular polyurethane.

The inserts for soap molds according to the invention can in principle be produced from a large number of plastics. In principle, all plastics that have previously been used in the stamping of soap are suitable, be it for the production of stamping dies made entirely of plastic or for coating stamping dies made of metal. Some examples of plastics which can be used for the stated purpose are mentioned in US Pat. Nos. 2,965,946.

Examples of plastics which can be used according to the invention to produce the soap mold inserts are those made from aliphatic or aromatic olefins and halogenated, in particular fluorinated, hydrocarbons. Polyamides, polyesters, silicone polymers, polyacrylates and polyurethanes can also be mentioned. Copolymers or block copolymers of these plastics can also be used. The plastics used expediently have good oil and fat resistance, high abrasion and tear resistance and a smooth and non-adhesive surface. The plastics used can in principle be elastomeric or not elasto er. Relatively hard plastics that are little to not elastomeric are preferably used. Their Shore hardness is preferably in a range from 70 to 110 (Shore A) or 20 to 80 (Shore D). The modulus of elasticity is preferably greater than 5-10 ⁷ N / m ² (Newtons per square meter) and is preferably in the range from greater 5-10 ⁷ N / m ² to 10 ¹⁰ N / m ² .

The soap mold inserts according to the invention are particularly preferably produced from polyurethane. Thermoplastic polyurethane is particularly suitable, in particular polyester-based one. The polyurethane is preferably injection-moldable.

The polyurethanes used are advantageously characterized by good oil and fat resistance and good mechanical stability. A high tear and abrasion resistance are an advantage, as is a smooth, non-stick surface.

The polyurethane preferably has at least one of the following properties:

A Shore A hardness of 70 to 110, preferably 75 to 100 and in particular 80 to 90;

A Shore D hardness of 20 to 80, preferably 30 to 70 and in particular 35 to 55;

A tensile strength of 30 to 60 N / mm ² , preferably 35 to 55 and in particular 40 to 50 N / mm ² ;

An elongation at break of 300 to 700% and preferably of 350 to 650%;

• an abrasion loss of 20 to 60 mm ³ and preferably 30 to 45 mm ³ ; A density of 1 to 1.4 g / cm ³ , preferably 1.10 to 1.30 g / cm ³ and in particular 1.12 to 1.25 g / cm ³ ;

• a melt viscosity (MVI) from 175 to 230 ° C, preferably from 185 to 220 ° C and in particular from 190 to 215 ° C; • a processing temperature of 170 to 230 ° C and in particular of 180 to 220 ° C.

Suitable thermoplastic polyurethanes are commercially available, for example, from Morton International GmbH under the IROGRAN® brand. Of these IROGRAN® polyurethanes, the products of the E and H series, thermoplastic polyurethanes based on polyester, are preferred.

The use according to the invention is preferred in one

Injection molding machine made with a special mold. The side of the insert that later comes into contact with the soap is made with a highly polished injection molding machine tool, so that a very smooth surface is created in the insert. This also contributes to the good removal of the soap from the use according to the invention.

In order to compensate for the layer thickness of the insert according to the invention, the soap molds (brass molds) are expediently larger than the soap to be pressed, depending on the thickness of the insert. The difference is compensated for by the use according to the invention.

The invention will be explained in more detail below using two exemplary embodiments. Unless stated otherwise, the percentages relate to percent by weight.

example 1

From conventional household soap with one. Total fat content of 65%, consisting of 80% beef tallow and 20% palm oil, were found in

Room temperature punched without cooling the die soap bars.

The die shape corresponded to the arrangement shown in FIG. 1. The

The plastic insert of the die was made of thermoplastic

Polyurethane IROGRAN® A 89 E 4346 manufactured by injection molding. For comparison, the same household soap was used for the same

Conditions Soap pieces of the same size with a metallic

Cutting die made without plastic insert. While in the case of the die according to the invention with polyurethane insert the soap pieces easily detached from the die and a throughput of 70 to 80 pieces of soap per minute was achieved, the soap pieces in the case of the purely metallic ones

Cutting die can be partially removed from the mold by hand, as the soap stuck to the mold. A continuous punching process was not feasible.

The soap bars obtained were then visually inspected with regard to their surface properties. Here means

1 smooth, shiny surface,

2 smooth, somewhat matt surface,

3 somewhat rough, matt surface, 4 rough surface with cracks or missing parts,

5 very rough surface with clear cracks and craters.

In each case 20 soap bars were examined according to the above criteria. This resulted in the following average values: punching die with polyurethane insert 1.3

Cutting die without polyurethane insert 5.

Example 2

In accordance with Example 1, soap bars were produced from a synthetic soap which comprised conventional cationic surfactants and a toilet soap which comprised 50% synthetic surfactants, 20% stearin soap, 5% coconut fat and 2% palmol.

In each case 20 bars of soap were prepared according to those described in Example 1

Criteria assessed. The following results were obtained: Synthetic soap 1.5

Toilet soap 1.4.

The use according to the invention has the following advantages:

The soap mold (brass mold) does not wear out.

2. It is no longer necessary to cool the soap mold. 3. The inside of the insert can be made so that shiny soaps can be made. 4. When replacing the insert, the soap shape does not have to change

Machine down, as the insert on the soap mold can be replaced when the soap mold is placed in the machine. 5. The insert does not wear out or hardly wears out, which means that it is possible to use the insert according to the invention a very large number of

To make soap bars.

Further details of the invention can be found in the subclaims.

Exemplary embodiments of the invention are shown in the drawing, namely:

1 shows a section through a soap mold according to the invention.

Fig. 2 shows a modified embodiment of the invention;

Fig. 3 shows a further embodiment of the invention.

1 shows a soap mold 1 with a depression 2. An insert 4 is arranged in the depression 2 and over an edge 3 of the depression 2.

The insert 4 is made of plastic, preferably polyurethane. For pressing or stamping soap bars, 2 raw soap masses are arranged in the recess. The insert 4 is provided so that the raw soap composition does not adhere to the soap mold 1 after pressing or punching. The insert 4 is fastened to the soap mold 1 with projections 5, 6, 7, 8 which engage in recesses 9, 10, 11, 12 of the soap mold 1. The recesses 9, 10, 11, 12 are dovetail-shaped in cross section. The projections 5, 6, 7, 8 have a corresponding trapezoidal cross section.

The soap mold 1 has an ejector 13 which carries a coating 14. The coating 14 is preferably also made of Plastic, especially polyurethane, formed. The coating of the ejector 13 can also consist of a different material.

The ejector 14 is moved in the direction of arrow A in order to eject the pressed soap from the depression 2 in the soap mold 1.

The insert 4 with its projections 5, 6, 7, 8 has the advantage that the insert 4 can be easily replaced. The insert 4 is completely removed from the soap mold 1 by detaching the projections 5, 6, 7, 8 from the recesses 9, 10, 11, 12. Then a new insert, which also has the projections 5, 6, 7, 8, is attached in a simple manner to the soap mold 1 by the projections 5, 6, 7, 8 in the recesses 9, 10, 11, 12 are arranged.

The coating 14 of the ejector 13 can be replaced in the same way.

To replace the insert 4, the soap mold 1 in the

Device for pressing or punching soap remain arranged. It is not necessary to remove soap mold 1.

2 shows a soap mold 15 with an insert 16. The insert 16 is detachably fastened with screws 17, 18 which engage in bores 19, 20 of the soap mold 15. The insert 16 has projections 21. These projections 21 are designed such that a lettering is formed in the soap bar when pressing or punching the soap bars. 2, the projections are arranged on a coating 22 of an ejector 23. For this purpose, the coating 22 has a projection 24 which engages in a dovetail-shaped recess 25 of the ejector 23. Because the projections 21 forming the lettering are arranged on the coating 22 of the ejector, it is possible to arrange coatings with different lettering on the ejector or also a coating 14 without lettering, as shown in FIG. 1. The screws 17, 18, which releasably fasten the insert 16 with the soap mold 15, are arranged outside a recess 26 in the soap mold. This ensures that the screws 17, 18 can not cause marks or other damage to the soap bar to be pressed.

FIG. 3 shows a soap mold 27 and a soap mold 28 arranged opposite the soap mold 27. The soap mold 27 carries an insert 29. The soap mold 28 carries an insert 30. Between the soap molds 27, 28 there is a soap stub 31 which is made from a raw soap composition With the help of the soap molds 27, 28 is punched. The soap mold 27 has an ejector 32. The ejector 32 in turn has projections 33 which are made of the same material as the ejector 32, for example made of brass. A coating 34 is provided on the ejector 32. The coating 34 completely surrounds the projections 33 of the ejector 32. Because the projections 33 of the ejector 32 engage in recesses 40 of the projections 35 of the coating 34, deformation of the projections 35 of the coating 34 is completely or at least largely avoided.

The coating 29 is arranged with projections 36, 37 in recesses 38, 39 of the soap dish 27.

After pressing or stamping the soap bar 31, the soap mold 28 is moved in the direction of arrow B, so that the soap bar 31 is ejected from the soap mold 27 by the ejector 32 moving in the direction of arrow A. It is also possible to remove the soap bar 31 from the soap mold 28 using a suction device or a removal bell (not shown).

Claims

claims

1. soap mold for pressing or punching soap bars, in which at least one bowl-shaped recess is provided in the soap mold, characterized in that in the at least one recess (2, 26) of the soap mold (1, 15, 27, 28) at least one prefabricated , one piece of the soap mold (1, 15, 27, 28) detachable insert (4, 16, 29, 30) made of plastic is used, and that the insert (4, 16, 29, 30) essentially the shape of the at least one Recess (2, 26) of the soap mold (1, 15, 27, 28) is simulated.

2. soap mold according to claim 1, characterized in that the at least one insert (4) at least partially over the edge (3) of the at least one recess (2).

3. soap mold according to claim 1, characterized in that the at least one insert (4, 16, 29, 30) has an at least approximately uniform layer thickness.

4. soap mold according to claim 3, characterized in that the at least one insert (4, 16, 29, 30) has a layer thickness between ten micrometers and five millimeters.

5. soap mold according to claim 1, characterized in that in the at least one insert (16, 29) at least one lettering is formed.

6. soap mold according to claim 5, characterized in that the at least one insert (29) in the area of the lettering on the side of the soap mold (27) facing recesses for receiving a corresponding lettering (33) of the soap mold (27).

7. soap mold according to claim 1, characterized in that the at least one insert (16) with at least one screw (17, 18) is releasably attached to the soap mold (15).

8. soap mold according to claim 1, characterized in that the at least one insert (4) by means of a plug connection (5, 6, 7, 8) is releasably attached to the soap mold (1).

9. soap mold according to claim 7 or 8, characterized in that the at least one screw (17, 18) and / or plug connection

(36, 37) is arranged outside the at least one depression (26).

10. soap mold according to claim 1, characterized in that the at least one insert (4, 16, 29, 30) has at least one opening for each ejector (13, 23, 32).

11. Soap mold according to claim 1, characterized in that a surface arranged in the recess (2) of the ejector (13) has an insert or a coating (14).

12. Soap mold according to claim 1 or 11, characterized in "that the at least one insert (4, 16, 29, 30) and / or the coating (14) consists of polyurethane.

13. Soap form according to claim 1 or 11, characterized in that the at least one insert (4, 16, 29, 30) and / or the coating (14) consists of plastics made from aliphatic or aromatic olefins or halogenated, in particular fluorinated hydrocarbons.

14. Soap mold according to claim 1 or 11, characterized in that the insert (4, 16, 29, 30) and / or the coating (14) consists of polyamide, polyester, silicone polymers or polyacrylates.

15. Soap mold according to claim 1 or 11, characterized in that the Shore hardness of the insert (4, 16, 29, 30) and / or the coating (14) in a range from 70 to 110 (Shore A) or 20 to 80 (Shore D).

16. soap mold according to claim 1 or 11, characterized in that the modulus of elasticity of the insert (4, 16, 29, 30) and / or the coating (14) is greater than 5-10 ⁷ N / m ² .

17. Soap mold according to claim 1 or 11, characterized in that the insert (4, 16, 29, 30) of the soap mold (1, 15, 27, 28) and / or the use of the ejector (13) is designed as an injection mold.

18. Soap mold according to claim 1 or 11, characterized in that the insert (4, 16, 29, 30) of the soap mold (1) and / or the insert of the ejector (13) is injection molded.

19. Soap mold according to claim 1, characterized in that an insert is provided for at least two wells.

20. Soap mold according to claim 1, characterized in that the soap mold (1, 15, 27, 28) consists of brass and / or aluminum.